Despite confusion over their message and tactics, independent truckers seeking to impeach President Obama and pressure Congress are rolling ahead with a holiday weekend protest that aims to jam traffic around the nation's capital.

Drivers plan to occupy three lanes of Interstate 495, driving 55 mph, with the fourth lane kept clear for emergency vehicles and supporters. Only motorists displaying the group's Twitterhashtagon their vehicles will be allowed to pass, Andrews and other organizers say, adding that the protest would be peaceful and lawful.

On Monday, a Georgia trucker handling logistics forTruckers Ride for the Constitutionindicated otherwise,tellingU.S. Newsthat some of the anticipated 3,000 big rigs might grind to a halt if police intervened and that a trucker "grand jury" would attempt to arrest members of Congress. The group disavowed the comments by Earl Conlon and said he was not an official spokesman.

On Tuesday,The Washington Postdeclaredthat the truckers' plan was actually a "hoax," with Conlon telling the paper his comments were "designed to do one thing and one thing only: stir the feather of the mainstream media."

Andrews and supporters quickly denied that claim, but confusion persisted and trucker representatives criticized the ride.

"The individuals leading this particular effort have no direct affiliation with trucking and appear to be using truckers in order to gain media attention and air other political grievances," the Owner-Operator Independent Drivers Association said in a statement. "We do not support assembling in an unlawful, unpermitted manner, committing crimes, making threats on our lawmakers, or behaving in such a way to cast safe, professional truck drivers in a negative light."

A spokesman for the International Brotherhood of Teamsters UniontoldtheWashington Timesthat the union has no involvement in or position on the protest.

The Virginia State Police said in a statement Thursday that it is "preparing accordingly with the region's law enforcement agencies and the Virginia Department of Transportation." Extra patrols will be on duty in Northern Virginia.

State police in Maryland and Pennsylvania did not respond to queries about their plans.

Trucker Earl Lee, a coordinator,toldFox News on Thursday that 10,000 truckers were headed to Washington.

In an earliervideofor drivers, he said that convoys would leave at 7 a.m. Friday from Exit 98 on I-95 in Doswell, Va., and Exit 77 on I-81, near Hershey, Pa. They were expected to arrive in the D.C. area about 3 p.m.

Three, eight-hour driving shifts are planned, with a possibility that the protest would continue Monday, the Columbus Day holiday.

Lee cautioned drivers to obey all traffic laws.

"You got to stay legal; we don't want any illegal activity," he said, adding that "none of you guys want tickets or points on your CDL (commercial driver's license) either.

Launched in September as "Truckers to Shut Down America" (T2SDA), the protestenvisionedthat "potentially hundreds of thousands of truckers and millions of citizens" would come to Washington in a "very symbolic display of solidarity" to "restrore our Constitutional Republic." As word spread through Twitter and Facebook, the group changed the event's name but kept the hashtag.

The truckers have a long list of grievances and outrages. Most are political with some focused on trucking issues, including wages, fuel costs and regulations. On Friday, they will present a list of"U.S. Citizens demands"to U.S. Rep. Louie Gohmert, R-Texas, at the National World War II Memorial.

Andrews, the co-organizer, is a Tennessean, former country music singer andconservative patriotwho lives in Jacksonville. She has actively called for Obama to be impeached.

On Tuesday night, she promoted the event on Fox News and Glen Beck'sThe Blaze.

"We want the president of the United States removed from office," shetoldFox News' Greta Van Susteren. "He's a threat to our national security, he's a threat to our way of life, he's a threat to our future generations."

A fundamentalist Christian, Andrews has said she opposes Islam andbelievesthe president is a Muslim and "the Antichrist." She also disputes official explanations for the Sept. 11 and Boston Marathon terror attacks.

The liberal group Media Matters for America hasmoreon Andrews and some of her views.

USA TODAY attempted to interview Andrews on Thursday but could not reach her as she headed to Washington.

The official spokesman for the trucker's ride is Pete Santilli, an Internet broadcaster and conspiracy theorist. He gained some notoriety in May when hesaidon the Guerilla Media Network that "we need to try, convict and shoot Hillary Clinton in the vagina" for what he claims was the "fake hunt down" of Osama bin Laden during which all the Navy SEALs involved allegedly were killed.